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Verbal Reasoning
Computer Science
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Numbers
217 x 217 + 183 x 183 =?
79698
80578
80698
81268
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Correct Answer:
80578
Explanation:
(217)
2
+ (183)
2
= (200 + 17)
2
+ (200 - 17)
2
= 2 x [(200)
2
+ (17)
2
] [
Ref:
(a + b)
2
+ (a - b)
2
= 2(a
2
+ b
2
)]
= 2[40000 + 289]
= 2 x 40289
= 80578.
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